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		<p>track 标签为诸如 video 元素之类的媒介规定外部文本轨道。</p>
		<video width="320" height="240" controls="controls">
			<source src="../img/vedio.mp4" type="video/mp4" />
			<source src="../img/video.webm" type="video/webm=" zh " label="Chinese ">
			<track kind="subtitles " src="subs_eng.srt " srclang="en " label="English ">
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